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Finding the Fourth Proportional to 21,851.08, 30,157.08 and 12,421.06

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Solution

The fourth proportional to 21,851.08, 30,157.08 and 12,421.06 is: 17,142.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,851.08 : 30,157.08 = 12,421.06 : x
  2. Step 2: Convert to fraction form
    21,851.08/30,157.08 = 12,421.06/x
  3. Step 3: Cross multiply
    21,851.08x = 30,157.08 × 12,421.06
  4. Step 4: Simplify right side
    21,851.08x = 374,582,900.10
  5. Step 5: Solve for x
    x = 374,582,900.10/21,851.08
  6. Step 6: Final answer
    x = 17,142.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.